YMMV: A Study in Emerald

  • Designated Villain: The murderous duo that the protagonists chase. The reader sympathises with their attempts to free humanity by killing the Old Ones. Unusually for this trope, the YMMV aspect is that some readers would debate whether or not the murderous duos were designated as the villain of the piece, or if they were intended to be the heroes.
  • Genius Bonus (leading to Fridge Horror): During the historical play, "The Czar Unanswerable" is mentioned one of the Eldritch Abominations that took over the world seven hundred years earlier. At the end, the narrator refers to "recent events in Russia" as being a Very Bad Thing, and gives the year as 1881. What happened in Russia in 1881? The assassination of the reformist Czar Alexander II, which led to a brutal crackdown on any hint of liberalism by his successors (and, in turn, to further extremism from the anti-monarchists which led to the 1917 Russian Revolution, the Bolshevik takeover, and all its subsequent wonderfulness). If someone actually managed to kill one of the Old Ones, the retribution from his family would be quite unpleasant.
    • Which also has the implications that the Bolsheviks were right in everything. Purifying your country squeaky clean of any and all Eldritch Abomination influence? Yay Lenin!
      • Hastur is one of the mortal-friendly Old Ones compared to the others.
    • Sherry Vernet. An offhand comment by Holmes is that his grandmother was the sister of an artist named Vernet.
    • Readers who are particularly knowledgable about Sherlock Holmes will realize earlier the protagonists' real identities as Moran and Moriarty.
    • It's pretty common for professionally published pastiches to write around trademarks by leaving characters unnamed, so the narrator only referring to the detective as "my friend" is unsurprising. Thus putting the audience off from the REAL reason that they remain unnamed until the end.
  • Nightmare Fuel: The narrator's description of his encounter with an Eldritch Abomination which maimed him, killed every other soldier present and left him extremely traumatised.